Hashtags and domain-less accounts are searched on all configured servers. Accounts with a domain are now always fetched from their home server.
closes#2
Using rem-based sizing for the columns means that there is up to hallf a column (10rem) space on each side before another column can be added. We now use percent-based sizing instead and decide on the column count via CSS media queries based on avalable screen space. Still relative ro rem, so zoom still works.
